19581991

素因数分解:

${\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{37}}^1\times {\mathrm{3701}}^1$

素因数の和:3762

約数の個数: 16

約数和(自身を含む): 23633568

約数和(自身を除く): 4051577

約数列:

[1, 11, 13, 37, 143, 407, 481, 3701, 5291, 40711, 48113, 136937, 529243, 1506307, 1780181, 19581991]

約数ペア:

[(1, 19581991), (11, 1780181), (13, 1506307), (37, 529243), (143, 136937), (407, 48113), (481, 40711), (3701, 5291)]